A graphics talk with no visuals!

So, I’m at MIT, twenty minutes into my talk on tradeoffs in information graphics to the computer scientists, when the power goes out. They had some dim backup lighting so we weren’t all sitting there in the dark, but the projector wasn’t working. So I took questions for the remaining 40 minutes. It went well, perhaps better than the actual talk would’ve gone, even though they didn’t get to see most of my slides.